AR1020-I/ML Microchip Technology, AR1020-I/ML Datasheet - Page 26

• Manufacturer Part Number: AR1020-I/ML
• Description: IC TOUCH SCREEN CTRLR 20-QFN
• Manufacturer: Microchip Technology
• Type: Resistiver

Specifications of AR1020-I/ML

• Resolution (bits): 10 b
• Touch Panel Interface: 4-Wire, 5-Wire, 8-Wire
• Number Of Inputs/keys: 3 Key
• Data Interface: I²C, Serial, SPI™
• Voltage - Supply: 3.3 V ~ 5.5 V
• Current - Supply: 17mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-VQFN Exposed Pad, 20-HVQFN, 20-SQFN, 20-DHVQFN
• Voltage Supply Source: Single Supply
• Controller Type: Touch Screen
• Ic Interface Type: I2C, SPI
• Supply Voltage Range: 3.3V To 5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: QFN
• No. Of Pins: 20
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sampling Rate (per Second): -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

7.15.8 EEPROM Read - 0x28
The controller has 256 bytes of on-board EEPROM.


This command provides a means to read values from the EEPROM.
Send
Receive : <0x55><0x02 + # EEPROM Read><Response><0x28><EEPROM value>…<EEPROM value>
7.15.9 EEPROM Write - 0x29
The controller has 256 bytes of on-board EEPROM.


This command provides a means to write values to the EEPROM.
Write to EEPROM as follows.
Send: <0x55><0x04 + # EEPROM to Write><0x29><EEPROM Address High byte><EEPROM Address Low byte>
Receive : <0x55><0x02><Response><0x29>
7.15.10 EEPROM Write to Registers - 0x2B
Write applicable EEPROM data to Configuration Registers. This will cause the controller to immediately begin
using changes made to EEPROM stored Configuration Register values. A power cycle of the controller will
automatically cause the controller to use changes made to the EEPROM stored Configuration Register values,
without the need for issuing this command. This command eliminates the need for the power cycle.
Send
Receive : <0x55><0x02><Response><0x2B>
DS41393A-Page 22
Warning: ONLY write to user EEPROM addresses of 0x80–0xFF.
One of the following actions is required for EEPROM changes to be used by the controller.


The first 128 bytes (address range 0x00–0x7F) are reserved by the controller for the configuration register
settings and calibration data.
The second 128 bytes (address range 0x80–0xFF) are provided for the user’s application, if desired.
The first 128 bytes (address range 0x00–0x7F) are reserved by the controller for the configuration register
settings and calibration data.
The second 128 bytes (address range 0x80–0xFF) are provided for the user’s application, if desired.
The controller power must be cycled from OFF to ON
or
Issue the “EEPROM Write to Registers” command
: <0x55><0x04><0x28><EEPROM Address High byte><EEPROM Address Low byte><# of EEPROM to Read>
# of EEPROM to Read
EEPROM Address High byte : 0x00
<# of EEPROM to Write><Data>…<Data>
# of EEPROM to Write
EEPROM Address High byte : 0x00
: <0x55><0x01><0x2B>
: 0x01 thru 0x08
: 0x01 thru 0x08
© 2009 Microchip Technology, Inc.